The biggest problem here, as it stands, is the fact that the piece is poorly written and formatted.

The draft is written with quite a few SPaG errors, which already speaks volumes about the effort you've put in:

When SCP-XXXX-1 escapes captivity inside of the door, a brown paper bag tainted with blood is to be shown to the humanoid figure. Similar tov'Mr. Brown.' (typo)

Known forms of SCP-XXXX-1 Have the ability (incorrect capitalisation)

When the humanoid was asked "What are you?" or any similar question, it responded with saying."You are not invited to the party." (typo, misplaced period/fullstop)

This is also not mentioning the fact that your description barely describes what the anomaly actually does. There's exactly one sentence which describes what it does: "When SCP-XXXX is opened, it will open itself to a place in time, sometimes opening to otherworldly beings," which is confusing and leaves several questions hanging: any time periods in particular? does it open on a different location to the room on the other side?

Worst of all, you've sacrificed clarity of description to describe dull monsters with no apparent connection to the anomaly outside of "SPOOPY". A humanoid in black clothing and a tragedy mask reminds me of a stock slasher murderer, and the Mr. Black/Brown section is a guy with, uh, really long fingers. That is, if I've understood it correctly, which I'm not sure I've done because of the aforementioned SPaG errors.

While you don't have to provide sixteen addenda and a Note At The End™ to make a good skip, all we have here is a door to an otherworldly location, with the additional lack of spice that a "scary" monster brings to the table. There's nothing in this piece (no character, no interesting twist) to make me want to read it.